Calculator

Lab tracker

Log dated results for A1c, glucose, lipids, kidney and liver panels, TSH, lipase, B12, vitamin D, iron, blood count and electrolytes. Each test gets a trend table and a sparkline spaced by date, with the common reference range and its source alongside. Export or import a CSV. Everything stays in your browser; nothing is sent to a server and no value is flagged or interpreted.

By FormBlends editorial teamAssumptions checked September 4, 2026 Runs in your browser; nothing is sent to a server

What it computes

Enter dated results for 33 common tests, see a trend line per test, export CSV. Stays in your browser.

Never pre-fills a dose

Add a result

Test

Date drawn

Use the collection date on the report, not the day you read it.

Result

Pick a test to see its unit.

Note (optional)

Fasting or not, which lab, a dose change that week.

Everything you enter stays in this browser. Nothing is sent to a server, and there is no account. The list is kept in this browser's local storage so it survives a reload; clearing site data or using another device starts from an empty list. Export a CSV to keep a copy.

Trends

Add two or more dated results for a test and a trend line appears here. The line shows direction and spacing over time. It does not say whether a value is normal; that is the job of the range printed on your report and the clinician who ordered it.

Formulashown in full, nothing hidden

series(test)   = entries for that test sorted by collection date
change         = last value - first value
percent change = change / first value x 100
direction      = 'about the same' if |percent change| < 2, else higher or lower
sparkline x    = position by date between first and last draw (gaps stay gaps)
sparkline y    = position by value between the series minimum and maximum
CSV            = date, test_id, test_name, value, unit, note
no comparison to a range, no flag, no score

The tracker keeps your numbers in order and draws them. It deliberately does not mark a value as high or low. The range printed on your report was set by the laboratory that ran the sample for its own method and population; the ranges quoted here are the common ones from public sources and can differ.

Assumptions, checked September 4, 2026what the arithmetic takes as given

Common ranges in the test list were copied from the cited MedlinePlus pages and the KDIGO 2024 guideline on 2026-09-04. They are shown for orientation, not as targets.
Units are the ones used on the source page (mg/dL, U/L, µU/mL, pg/mL, ng/mL, mEq/L). If your report uses SI units (mmol/L, pmol/L, nmol/L), convert before entering, or keep a separate note.
The 2% threshold for 'about the same' is a display choice. Two A1c results 0.1 apart can be within assay noise; two potassium results 0.5 apart can matter. Only your clinician can say which.
Data lives in this browser only (33 tests supported). No upload, no account, no analytics on values.

This calculator is an arithmetic aid for medication a licensed prescriber has already prescribed. It does not recommend a dose. Confirm any result with your prescriber or pharmacist before use.

Sources

Read before you use it

Guides for this calculator

Paper-cut illustration of an open book with a ribbon bookmark and a small compass rose

Lab monitoring calendar for GLP-1 therapy: what is repeated, when, and which triggers move the date

You'll get: The GLP-1 labels set no lab schedule. They set one trigger: check kidney function if vomiting or diarrhoea is draining you.

A phase-by-phase calendar for labs on semaglutide or tirzepatide: baseline, the first 12 weeks, months 3 to 12, and beyond a year. Built from the label re-check instruction, the ADA intervals for diabetes, KDIGO for kidney disease, and the symptom triggers that bring a test forward. With a browser-only tracker.

Updated September 4, 2026

Educational, not medical advice. Read the medical disclaimer.