Expert Q&A

Unable to get diagnosis in UK - how do I get most accurate blood test during the weight loss plateau phase

Understanding Weight Loss Plateaus in Midlife

As a leading voice at CFP Weight Loss, I've worked with thousands of women aged 45-54 who hit a weight loss plateau despite doing everything right. Hormonal shifts during perimenopause and menopause often stall progress, making fat loss feel impossible. Joint pain, diabetes management, and high blood pressure compound the frustration. Without a formal UK diagnosis, you can still take control by ordering precise blood tests that reveal hidden metabolic roadblocks.

My approach in The CFP Method emphasizes data-driven decisions over guesswork. Accurate testing during a plateau helps identify issues like elevated cortisol, sluggish thyroid function, or creeping insulin resistance that standard diets miss. This empowers you to adjust nutrition and movement without spending hours in the gym or following complicated meal plans.

Key Blood Tests for Accurate Plateau Diagnosis

Focus on a comprehensive panel rather than single markers. Request these tests: Complete Thyroid Panel (TSH, free T3, free T4, reverse T3), fasting insulin and glucose (to calculate HOMA-IR score), HbA1c, cortisol (morning and diurnal if possible), sex hormones (estradiol, progesterone, testosterone), vitamin D, and inflammatory markers like CRP. For those managing diabetes or blood pressure, include a full lipid profile and kidney function tests.

In the US, use direct-to-consumer labs like Quest Diagnostics or LabCorp via services such as Ulta Lab Tests or MyMedLab. Costs typically range from $150-$350 for a full metabolic and hormone panel—far more affordable than insurance-denied programs. Avoid basic annual physicals; they rarely include reverse T3 or fasting insulin, which are critical during plateaus.

Timing Your Tests for Maximum Accuracy

Schedule blood draws during the plateau phase when your weight has been stable for at least 3-4 weeks. Test first thing in the morning (7-9am) after a 12-hour fast for accurate glucose and insulin readings. For women, time tests to your cycle if still menstruating—days 19-21 of a 28-day cycle best captures progesterone and estrogen balance. Avoid testing during acute stress, illness, or right after intense exercise, as these skew cortisol and thyroid results.

Track symptoms in a simple journal: energy levels, joint pain, cravings, and sleep quality. This context turns numbers into actionable insights. In The CFP Method, we use these results to create 15-minute daily movement plans that respect joint limitations while gently reversing metabolic slowdown.

Interpreting Results and Next Steps

Optimal ranges differ from “normal” lab ranges. For example, aim for TSH under 2.0 mIU/L (not 4.5), fasting insulin below 8 μU/mL, and morning cortisol between 15-20 μg/dL. If results show imbalances, prioritize fixing sleep, reducing hidden sugars, and adding targeted resistance movements that don't aggravate joint pain. Many clients see renewed fat loss within 4-6 weeks after adjustments.

Start by ordering your panel this week. The data removes the overwhelm of conflicting nutrition advice and builds confidence without embarrassment. Thousands have broken through plateaus using this precise-testing approach—your turn starts with one blood draw.

💬 What the Community Says

In online forums and support groups, many midlife women in the US express frustration over UK-style NHS diagnosis barriers and turn to direct lab testing during weight loss stalls. Most report that comprehensive thyroid and insulin panels ordered through Quest or Ulta Lab Tests provided the clarity their doctors missed, especially around perimenopause hormones. A common theme is timing tests correctly in the morning while fasting, which several say revealed hidden insulin resistance or suboptimal T3 levels. Some debate the cost, noting $200 panels feel expensive on middle incomes yet cheaper than failed diet programs. Lived experiences highlight renewed motivation once results explained stubborn plateaus, though a vocal minority warns against self-interpreting without professional guidance. Joint pain and diabetes management often come up as reasons people seek bloodwork before restarting exercise. Overall sentiment leans positive toward empowering self-testing but calls for pairing results with sustainable lifestyle changes.
Cite this answer
Clark, R. (2026). Unable to get diagnosis in UK - how do I get most accurate blood test during the. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/unable-to-get-diagnosis-in-uk-how-do-i-get-most-accurate-blood-test-during-the-weight-loss-plateau-phase
Russell Clark, FNP-C, APRN, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ LDN is changing my life, will this last — what do certified weight loss coaches recommend — what certified coaches recommend? ▸ When period stopped did you feel like the worst pmdd of all time daily or while doing intermittent fasting? ▸ How does i started this year vs. How I'm finishing it - 220lbs -> 135lbs 🩷 while intermittent fasting during the weight loss plateau phase? 📖 GLP-1 Receptor Agonist — A class of medication that mimics natural hormones to improve insulin secretion and slow gastric emptying, used strategi… ▸ Can Maintenance Phase do an episode about pregnancy weight gain — what do certified weight loss coaches recommend if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Will doing omad 2-3 times a week get rid of it or reduce loose skin? I'm in my 20s if you're on a GLP-1 like semaglutide or tirzepatide and its effect on metabolism and insulin levels? ▸ Anyone here have any experience with SIBO and Keto for people with insulin resistance during the weight loss plateau phase? ▸ When fed ex secures the goods when you have PCOS or hormonal imbalances: best practices and common mistakes to avoid? ▸ Have you switched from Semaglutide to Tirzapatide? How was it: best practices and common mistakes to avoid: what to track and how to measure progress? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Anyone worried about the FDA crackdown — what most people get wrong about this during the weight loss plateau phase? ▸ When Someone Paid by Credit Card, We Had to Drag Out This — what most people get wrong about this if you're on a GLP-1 like semaglutide or tirzepatide? 📖 Autophagy — The body's natural 'housecleaning' process that occurs during fasting or low-insulin states, promoted during our mainten… ▸ Anyone micro dosing to help cut out alcohol and its effect on metabolism and insulin levels and how it connects to gut health and inflammation? ▸ What made you start carnivore and how it connects to gut health and inflammation? ▸ My stomach is killing me, any advice — what most people get wrong about this — what certified coaches recommend? 📖 Strategic Fat Loading — A critical 48-hour phase at the start of the reset where we prime the body with healthy fats to trigger the transition f… ▸ Anybody else wake up after 5-6 hours because their lower back starts hurting — what does the research actually say and how it connects to gut health and inflammation? ▸ Anyone have high cholesterol or know more about the link between high cholesterol and hypothyroidism when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? ▸ Gave up all my vices… unsure of what to do with myself now: how to talk to your doctor about this while doing intermittent fasting? ▸ When fed ex secures the goods when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Diabetics with TPN (IV nutrition experience) on a low-carb or ketogenic diet if you're on a GLP-1 like semaglutide or tirzepatide? ▸ When you get your microdose calculations wrong for the Monday morning meeting for people with insulin resistance during the weight loss plateau phase? ▸ Lost weight then gained it back on keto: what to track and how to measure progress specifically for women over 40? ▸ My friends stopped being impressed by my weight loss ages ago. I just reached my goal weight, would you cheer for me in their place: what to track and how to measure progress: best practices and common mistakes to avoid? 📖 Lectin-Free Living — Eliminating inflammatory plant proteins that damage the gut lining and trigger the autoimmune responses that often stall… ▸ Anyone else feel this way and the role of cortisol and stress hormones while doing intermittent fasting? ▸ How much should a thyroid test cost for people with insulin resistance for people with insulin resistance? ▸ Thoughts about these together during the weight loss plateau phase and how it connects to gut health and inflammation? ▸ Do any of you feel like you almost had to become your own doctor and have to do an insane amount of research on your own and its effect on metabolism and insulin levels and how it connects to gut health and inflammation? ▸ How long was your withdrawal when you went sugarfree if you're on a GLP-1 like semaglutide or tirzepatide — what certified coaches recommend? 📖 Tirzepatide Micro-Dosing — The practice of using the lowest effective dose to achieve results, minimizing side effects while maximizing the longevi… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Is this meat grassfed — what do certified weight loss coaches recommend: what to track and how to measure progress? ▸ Did an ultrasound and i saw two comments from the result. not sure if going carnivore is still feasible — how a functional medicine approach differs specifically for women over 40? ▸ How a few gut-focused changes (extra virgin olive oil, enzymes, and more) quietly transformed my health — what most people get wrong about this while doing intermittent fasting? 📖 Hidden Hunger — A state where the body is overfed but undernourished, leading to constant cravings because the brain isn't receiving the… ▸ How the heck do people with health anxiety handle anxiety med side effects: what to track and how to measure progress for people with insulin resistance? ▸ “You shouldn’t feel anything” while doing intermittent fasting when you have PCOS or hormonal imbalances? ▸ Any Links Between Autophagy & Eye Disease Reversing when you have PCOS or hormonal imbalances for people with insulin resistance? ▸ How much weight do you give to mechanism vs results when evaluating peptides — what do certified weight loss coaches recommend and its effect on metabolism and insulin levels? ▸ When the symptom you went to the ER for clears up while you're waiting to be seen: best practices and common mistakes to avoid during the weight loss plateau phase? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Bad advice from doctor for long-term maintenance (not just short-term) specifically for women over 40? ▸ How did I not get a heads up? I now make it my goal to help, support and inform others heading towards menooause and its effect on metabolism and insulin levels: what to track and how to measure progress? 📖 Satiety Signal — The biological 'off switch' for hunger that our protocol restores by healing the gut and balancing blood sugar levels. ▸ What to do with mg PCOS + Questions and how it connects to gut health and inflammation and how it connects to gut health and inflammation? ▸ Why are peptides suddenly everywhere in 2026 when most of them have been around for 20 or 30 years — what do certified weight loss coaches recommend during the weight loss plateau phase? ▸ Do you know any good empirical studies on LCHF and its effect on metabolism and insulin levels for people with insulin resistance? ▸ Has anyone from India done an extended fast? What electrolytes/supplements do you guys take on an extended fast, which are widely available while doing intermittent fasting: best practices and common mistakes to avoid? ▸ Gaining tons of weight but normal levels — what does the research actually say for people with insulin resistance? ▸ Does anyone have ant literature or knowledge on autophagy and loose skin for long-term maintenance (not just short-term): what to track and how to measure progress? ▸ Anyone else feel this way and the role of cortisol and stress hormones and its effect on metabolism and insulin levels? 📖 Hormonal Chaos — The internal state of imbalance caused by modern grains and refined carbs that overrides willpower and forces the body t… 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Anyone here have any experience with SIBO and Keto for people with insulin resistance for long-term maintenance (not just short-term)? ▸ How I cured my bad breath. Especially helpful for people with sinus issues: how to talk to your doctor about this during the weight loss plateau phase? ▸ Should I be concerned over 457 Total Cholesterol and 369 LDL while doing intermittent fasting: best practices and common mistakes to avoid? ▸ Can anyone help me with my pelvic ultrasound results ? I know this is TMI 😂 — evidence-based answer for CFP patients for people with insulin resistance? 📖 CICO (Calories In, Calories Out) — An outdated model of weight loss that ignores the role of hormones; we challenge this by focusing on food quality and ho… ▸ Does anyone else feel like they are living life at 50% and the role of cortisol and stress hormones — what the research actually says? ▸ Frustrated with lack of progress. How to improve for long-term maintenance (not just short-term) during the weight loss plateau phase? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what the research actually says?