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Hot Plate Latency Calculator

Per-animal response latency with cutoff clamping, group means with SEM, and CSV export. Ready for %MPE opioid dose-response workflows.

Mean LatencyCutoff HandlingCSV Export
Animal IDGroupT1 (s)T2 (s)T3 (s)

Cutoff: 30s. Values exceeding cutoff are clamped on calculation.

  • Compute per-animal hot plate response latency from repeated trials
  • Apply a prespecified cutoff before averaging trial latencies
  • Summarize vehicle and treatment groups with mean latency and SEM
  • Export animal-level clamped latency data for GraphPad Prism, R, or Python
  • Prepare clamped means for downstream Pain %MPE analysis

Don't use for

  • Tail flick radiant heat assays, which use a shorter cutoff and spinal reflex endpoint
  • Hargreaves plantar testing, which records left and right paw withdrawal latency separately

Resources

  • Temperature verified with independent thermometer
  • Cutoff agreed in advance
  • Two-observer scoring plan documented
  • Standardized response criterion written in protocol
  • Inter-trial interval at least 10 min
  • Ambient temperature 22 +/- 2 degrees Celsius
  • Animals weighed within 24 h of test

What Is the Hot Plate Test?

The hot plate test is a thermal nociception assay used in analgesic screening and pain model phenotyping. A rodent is placed on a temperature-controlled plate, usually 52 to 55 degrees Celsius, and the observer records the latency to a defined nocifensive response such as paw licking or jumping.

The endpoint is a response latency in seconds. Longer latencies often reflect reduced nociceptive responding, but interpretation depends on locomotor status, sedation, stimulus intensity, and consistent endpoint scoring.

Metrics and Math

This calculator clamps every trial above the cutoff to the cutoff value. It then computes each animal mean from the clamped trials and summarizes groups as mean latency with SEM.

Use the same cutoff in downstream %MPE analysis. If baseline latency is available, compute %MPE as ((post-drug latency - baseline latency) / (cutoff latency - baseline latency)) x 100 in the Pain %MPE Calculator.

Best Practices

Set the cutoff before data collection and apply it to every animal. Verify plate temperature with an independent thermometer, standardize ambient temperature, and blind observers to treatment when manual scoring is used.

Predefine the response criterion, keep inter-trial intervals at 10 minutes or longer, and review video when response calls are ambiguous.

Frequently Asked Questions

Next Steps

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