Why do freeze-thaw cycles matter?

Each freeze-thaw cycle exposes a sample to ice crystal formation, pH shifts, and local concentration changes that can degrade proteins, denature enzymes, and fragment nucleic acids. Limiting cycles preserves analyte integrity and result reliability.

How many cycles are acceptable?

It depends on the analyte. Many serum protein assays tolerate about 3 cycles, while sensitive analytes may allow only 1. The tool lets you set the limit and flags any aliquot that reaches it, so you can apply your own validated threshold.

What is the single-use aliquoting strategy?

Splitting a sample into several small single-use aliquots means each future analysis thaws a fresh aliquot exactly once, instead of repeatedly thawing one tube. The tool divides remaining volume by the volume per analysis to show how many aliquots you can make.

Where is my data stored?

Aliquot labels and cycle counts are saved only in your own browser using local storage. Nothing is uploaded to a server. Clearing your browser data or using a different device will reset the log.

Can I undo a thaw I logged by mistake?

Yes. Each aliquot has a minus-one button that decrements its cycle count without going below zero, and a remove button to delete the aliquot entirely if it was added in error.

Sample Freeze-Thaw Cycle Tracker

Repeated freeze-thaw cycles are one of the quietest causes of unreliable lab results: a tube that has been thawed five times may give a value that no longer reflects the original sample. This tracker logs cycles per aliquot, flags any that exceed your limit, and helps you aliquot remaining volume so each future analysis uses a fresh, single-thaw tube.

How it works

The tool keeps a running cycle count per aliquot and compares it to your limit:

flagged  if  cycles ≥ max_cycles

For the remaining volume, it works out how many single-use aliquots you can cut:

aliquot_count = floor(remaining_volume / volume_per_analysis)
leftover      = remaining_volume − aliquot_count × volume_per_analysis

Each single-use aliquot is then thawed only once, keeping every future result within a single freeze-thaw cycle. Counts persist in your browser’s local storage between visits.

Tips and notes

Set the maximum to match your most sensitive validated assay rather than the most tolerant one, because a single shared tube is only as good as its weakest analyte. Label aliquots clearly so the log matches your physical tubes, and record the thaw at the moment of removal rather than later. All data stays in your browser; nothing is uploaded, so use a consistent device or export your own records for audit purposes.