✅ The Basics — Start Here

What this panel can settle, and by what logic

Four $9 tests, and their value is not any single result. It is that between them they tell you which direction to spend real money in, which is worth more than a guess at a $250 panel.

1. The Complete Blood Count (CBC) with Differential routes anemia before you have paid for iron studies. Red cell size does the work: a low hemoglobin with a low MCV points at iron, a low hemoglobin with a high MCV points at B12 or folate, and the two lead to different $20 tests. Platelets are the quiet one — a persistently low platelet count on an otherwise unremarkable panel is one of the earliest signs of advanced liver disease.
2. The Comprehensive Metabolic Panel (CMP) is three organs in one tube. Creatinine and electrolytes for kidney, ALT and AST and bilirubin and albumin for liver, and a fasting glucose that makes the HbA1c (Hemoglobin A1c) beside it interpretable rather than isolated.
3. The Lipid Panel (Cholesterol, HDL, LDL, Triglycerides) earns its place through the triglyceride to HDL ratio as much as through the cholesterol. Above roughly 2, in the presence of a normal glucose, it is the cheapest hint of insulin resistance available.
4. HbA1c (Hemoglobin A1c) is here because it needs no fast and cannot be improved by a good week, which makes it the honest member of a panel people prepare for Chen 2022. A raised ALT with a raised HbA1c on the same $36 is a single finding rather than two, and it is the commonest one this panel turns up Lonardo 2024.

What it cannot settle, and what would

It has no Ferritin, so it cannot see iron stores. Stores empty long before hemoglobin falls, so a hemoglobin of 13.8 g/dL on this panel is entirely compatible with iron deficiency — and there is still no globally agreed ferritin threshold for that diagnosis Cancado 2025. If fatigue is the reason you are testing, this is the $9 the panel is missing.

A normal ALT does not clear the liver. Among middle-aged adults with overweight and liver enzymes inside the reference interval, steatotic liver disease was present in 42% van Son 2024. Turned around, more than 80% of people who have fatty liver carry an ALT that this panel will call normal Lonardo 2024. The Comprehensive Metabolic Panel (CMP) is a screen for liver injury, not for liver fat.

The eGFR is calculated from creatinine, which is a muscle product. If you lift or supplement creatine it reads low and looks like kidney disease; if you are frail it reads high and hides it. Where the creatinine-based and cystatin C-based estimates disagree, the disagreement itself tells you which to believe Wang 2023, and Cystatin C with eGFR is not on this list.

And nothing here is hormonal. No TSH (Thyroid-Stimulating Hormone), no Total Testosterone, no Estradiol, Sensitive (LC/MS-MS), no Vitamin D (25-Hydroxy). If the complaint is fatigue, low mood, low libido or cold intolerance, this panel can only rule out the mechanical causes — which is a real use, but it means four normal results are a starting point rather than an answer.

Draw conditions that decide whether the money is wasted

Cheap tests are spoiled by the same things expensive ones are, and on a $36 panel the waste is proportionally larger.

1. Fast 9 to 12 hours for the triglycerides and the glucose. Both follow the last meal directly, and on most reports LDL cholesterol is calculated from the triglyceride value rather than measured, so one non-fasting number spoils two lines of the Lipid Panel (Cholesterol, HDL, LDL, Triglycerides).
2. No hard training for 48 hours. AST and ALT on the Comprehensive Metabolic Panel (CMP) both rise from muscle work, and creatinine rises with it, so a session the day before can produce a liver flag and a kidney flag on the same report in somebody with neither problem Wang 2023.
3. Hydrate normally, and do not arrive dehydrated. Creatinine, albumin, hemoglobin and hematocrit all concentrate together, which is how a dry morning turns into four borderline results and a repeat purchase.
4. Do not draw within a few weeks of donating blood. The hemoglobin is obviously affected; less obviously, so is the HbA1c (Hemoglobin A1c), because a population of young red cells has had less time to glycate Chen 2022.

How you would know it answered your question, and what each pattern means next

This panel is a router. Every abnormal result here has one correct next purchase, and it is rarely a repeat of this.

• Low hemoglobin with a low MCV: Ferritin and an Iron Panel (Iron, TIBC, Transferrin Saturation) next, not a second Complete Blood Count (CBC) with Differential. Retest hemoglobin only after 12 weeks of treatment, because a store that took months to empty refills over months Cancado 2025.
• Raised ALT with central weight: the commonest real finding here. Repeat it once at 8 to 12 weeks with no alcohol and no hard training in the preceding 72 hours; if it persists, the question is fibrosis and the panel that answers it is a liver-directed one Lonardo 2024 van Son 2024.
• Low eGFR in somebody muscular: Cystatin C with eGFR before anything else, because it is not derived from muscle and it resolves the discordance rather than repeating it Wang 2023.
• HbA1c (Hemoglobin A1c) 5.7% or above: add a Fasting Insulin for $10. The insulin tells you which side of the compensation you are on, which the HbA1c cannot Chen 2022.
• All four normal and you still feel wrong: the answer is not in these four. It is hormonal, or nutritional, or not in blood at all, and buying this panel again in 3 months will return the same four numbers.

Sources read for these sections

• van Son KC, et al. Prevalence of metabolic dysfunction-associated steatotic liver disease (MASLD) in a middle-aged population with overweight and normal liver enzymes, and diagnostic accuracy of noninvasive proxies. Medicine (Baltimore) 2024 · PMID 38181294
• Lonardo A. Alanine aminotransferase predicts incident steatotic liver disease of metabolic etiology: Long life to the old biomarker!. World Journal of Gastroenterology 2024 · PMID 38983954
• Wang Y, et al. Discordance Between Creatinine-Based and Cystatin C-Based Estimated GFR: Interpretation According to Performance Compared to Measured GFR. Kidney Medicine 2023 · PMID 37753251
• Chen Z, et al. Interpretation of HbA1c lies at the intersection of analytical methodology, clinical biochemistry and hematology (Review). Experimental and Therapeutic Medicine 2022 · PMID 36382101
• Cancado RD. Defining Global Thresholds for Serum Ferritin: A Challenging Mission in Establishing the Iron Deficiency Diagnosis in This Era of Striving for Health Equity. Diagnostics (Basel) 2025 · PMID 39941219