Plot AFP and β-hCG against expected half-life decay curves.
AFP: 7-day half-life · β-hCG: 3-day half-life.
Tumour Markers
Date
AFP
β-hCG
↵ new row · ⇥ next field
Treatments
Date
Treatment
Save / Load
Saves the chart as a PNG image with all data embedded invisibly.
Load a previously saved PNG to resume editing.
Created by Niclas Falklind
Enter measurements to see the chart.
How to use the Tumour Marker Tracker
Entering measurements
Each row in the Tumour Markers table represents one measurement occasion. Enter a date and one or both marker values, then press Tab to move to the next field or ↵ to open a new row. Rows can be sorted chronologically at any time with Sort by date.
Date formats accepted
YYMMDD — e.g. 260315 for 15 Mar 2026
MMDD — e.g. 0315 (current year assumed)
D mon or D mon YYYY — e.g. 15 mar or 15 mar 2026
Standard: 2026-03-15 or 15.03.2026
Units
Any unit is acceptable for AFP and β-hCG (IU/L, kIU/L, µg/L, etc.). The y-axis is logarithmic and unit-free. The only requirement is that you use the same unit consistently throughout a patient's series, so that the slope of decline is meaningful.
Reference decay lines
The grey lines show the expected exponential decline according to Swenoteca X:
AFP — 7-day half-life
β-hCG — 3-day half-life
Treatment annotations (optional)
Use the Treatments table to mark events such as orchiectomy, chemotherapy cycles, or radiotherapy. Each entry appears as a dashed vertical line on the chart, with the label shown above it (e.g. BEP cycle 1).
Saving and loading
Click ↓ Save PNG to download the chart as a PNG image. All data is invisibly embedded in the file — it is both a viewable image and a complete session file. Click ↑ Load PNG to restore any previously saved file and resume editing. The optional Patient initials field prefixes the filename for easy archiving.
Suggestions & feedback
I read every suggestion personally — your feedback helps make this tool better for everyone.
Clinical disclaimer. This tool is intended for use by qualified healthcare professionals only. It is designed to support clinical decision-making, not replace it. All clinical decisions remain the sole responsibility of the treating physician. Reference decay curves are based on Swenoteca X guidelines. No patient data entered into this tool is stored on any server — data resides solely in the user's browser and, optionally, in exported PNG files.