Health Tests · Labcorp OnDemand
Comprehensive Metabolic Panel (CMP) Test, $49
$49 · no doctor visit needed
- Order online, walk into 2,000+ locations — no appointment
- Physician order included — no doctor visit required
- Results in your portal in days
Same certified lab your doctor uses. HSA/FSA accepted.
Shopping links on this page go directly to Labcorp OnDemand. We don't earn a commission on orders.
Order online for $49, walk into any of 2,000+ locations for a blood draw — no doctor's visit needed. Fourteen markers in one panel — blood sugar, kidney function, liver enzymes, electrolytes, and protein — with results in a day, after a 12-hour fast.
The short version
$49, one walk-in visit, results in a day
The Comprehensive Metabolic Panel (CMP) Test ($49) measures 14 components of your blood in a single draw — the closest thing to a routine blood-work baseline you can buy without a doctor visit. Order online, fast for 12 hours, walk in for the draw, results in a day. It is a screen, not a diagnosis: one number out of range is usually a reason to retest and talk to a clinician, not a verdict.
Shopping links on this page go directly to Labcorp OnDemand. We don't earn a commission on orders.
Price
| Test | Price | |
|---|---|---|
| Comprehensive Metabolic Panel (CMP) Test | $49 | Order now → |
Prices checked Nov 10, 2026. HSA/FSA eligible. Self-pay; insurance not billed.
What the 14 markers measure — in four groups
The panel reads as four groups, not fourteen disconnected numbers. Blood sugar: glucose, the primary sugar in your blood — the reason the draw needs a fast, since a recent meal moves it. Kidney function: blood urea nitrogen (BUN) and creatinine, two waste products the kidneys filter out, plus the BUN-to-creatinine ratio and the estimated glomerular filtration rate (eGFR), a calculation from creatinine, age, and sex that estimates how well the kidneys are filtering. Liver function: the enzymes ALT, AST, and alkaline phosphatase, plus bilirubin (a waste product from broken-down red blood cells), albumin, total protein, and globulin. Electrolytes and minerals: sodium, potassium, chloride, carbon dioxide (bicarbonate, the acid-base buffer), and calcium. Together they describe metabolism, liver, and kidneys in one draw — which is why this is the panel most often ordered as routine blood work.
Why the 12-hour fast is not optional
Fast for 12 hours before the draw — no food or drink except water, which means no coffee or tea either. The fast matters most for glucose: a meal raises blood sugar for hours, and a non-fasting glucose number is read against a different range and tells you little. Fasting also keeps the other markers steadier. Book a morning draw and the fast is mostly sleep. If you take other tests in the same visit, check their prep rules separately — some need no fast at all, and a fasted draw covers both.
What a CMP can and cannot tell you
A CMP is a screening panel, and its own product page says plainly that it is not intended to diagnose any specific medical condition. What it does well: flag patterns worth following up — a high fasting glucose pointing at diabetes risk, a low eGFR or rising creatinine pointing at kidney function, liver enzymes pointing at liver inflammation, an electrolyte imbalance. What it cannot do: name the cause. An elevated ALT does not say why the liver is irritated; a low sodium does not say why it fell; a single high glucose does not diagnose diabetes. Abnormal results land with reference ranges printed alongside them — read the number against its own range, then take it to a clinician, who may repeat the test, add a more specific one, or look at the pattern across visits. One out-of-range value on a first CMP is common and usually a retest, not an emergency.
Fourteen markers means fourteen chances for a borderline result, and a single slightly-out-of-range number in an otherwise normal panel is usually noise, a fasting slip, a medication effect, or a lab variation. Repeat testing and clinical context turn a number into a plan — a shopping cart does not.
The thyroid catch — and who should add a test
One honest limit is printed on the product page itself: a CMP may reveal results that suggest abnormal thyroid function, but it does not directly measure thyroid function. If thyroid is the question — fatigue, weight change, feeling cold or hot all the time — the panel to add is a thyroid test, not a repeat CMP. The same logic applies across the board: the CMP answers the metabolic question; a cholesterol panel answers the lipid question; an HbA1c answers the three-month blood-sugar question. Buying the CMP when you wanted one of those is the commonest way to waste the price of the test — check the marker list against the question you are actually asking before you order.
How walk-in CMP testing works
You order the test online, then visit a patient service center for a standard venous blood draw — no doctor’s order, no appointment, and no insurance needed. The one prep rule that matters: fast for 12 hours before the sample collection (water only — no coffee or tea). Results typically post to a secure portal 1 day after your sample arrives at the lab. HSA/FSA accepted. The test must be taken by the purchaser, and it is available to adults 18 to 100. The product page currently shows a 20% off promo code — check the product page for the current price before ordering.
Common questions
Do I need to fast before a CMP test?
Yes. Fast for 12 hours before the blood draw — no food or drink except water, which means no coffee or tea either. Fasting keeps the glucose reading (and the other markers) comparable to the reference ranges; a non-fasting draw is read against a different range and tells you less.
What is the difference between a CMP and a CBC?
A complete blood count measures the cells in your blood — red cells, white cells, platelets. A CMP measures the chemistry dissolved in the liquid part of the blood — sugars, electrolytes, kidney and liver markers, proteins. They answer different questions, and a routine checkup often orders both together.
How often should I get a CMP?
Providers typically recommend routine blood tests such as a CMP once a year. If you are monitoring a known issue — kidney function, liver enzymes, blood sugar — your clinician sets the cadence, which may be more frequent. Ask your doctor what fits your situation.
Can a CMP diagnose diabetes or kidney disease?
No. The panel can flag the patterns that suggest those conditions — a high fasting glucose, a low eGFR — but it cannot diagnose them. Diagnosis needs confirmatory testing and a clinician reading the result against your history.
What does eGFR mean?
Estimated glomerular filtration rate — a calculation from your creatinine level, age, and sex that estimates how well your kidneys filter blood. The higher the number, the better the kidneys are working; a low result may be a sign of kidney disease. It is an estimate, not a direct measurement, so a low eGFR is a reason for follow-up, not a verdict.
Is this a home test kit?
No. This is an in-person blood draw at a patient service center — you order online, then walk in for the sample collection after a 12-hour fast. Your results arrive through a secure online portal, typically 1 day after your sample reaches the lab.
Why did one marker come back out of range?
A single borderline result is common: fourteen markers means fourteen chances for a value to sit just outside its range, and fasting slips, medications, hydration, recent illness, and lab variation all move individual numbers. The usual next step is a repeat draw and a clinician conversation — not a supplement order, and not alarm.
Ready to order?
Get your metabolic baseline this week
Order the Comprehensive Metabolic Panel (CMP) Test for $49 and walk in this week after a 12-hour fast — no doctor visit required.