🦋 Thyroid Uptake % (probe counts)
Probe-count % thyroid uptake with optional decay.
Clinical takeaway
Site geometry/SOP.
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When to use
Bedside RAIU arithmetic.
How it works
%≈100×(neck−bkg)/(std×decay).
Key points
- Site geometry/SOP.
References
- Classic probe RAIU methodology
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Neck counts | 50000 |
|---|---|
| Thigh/background counts | 2000 |
| Standard/phantom counts | 200000 |
| Hours since administration | 24 h |
| Nuclide | I-123 |
→% uptake84.63%
- net：48000
- decay factor：0.2836
- T½：13.2 h
| Neck counts | 50000 |
|---|---|
| Thigh/background counts | 2000 |
| Standard/phantom counts | 200000 |
| Hours since administration | 24 h |
| Nuclide | Tc-99m |
→% uptake382.23%
- net：48000
- decay factor：0.0628
- T½：6.01 h
Frequently asked questions
- What is Thyroid Uptake % (probe counts)?
- Probe-count % thyroid uptake with optional decay.
- How is Thyroid Uptake % (probe counts) calculated? What is the core formula?
- %≈100×(neck−bkg)/(std×decay).
- When is Thyroid Uptake % (probe counts) used?
- Bedside RAIU arithmetic.
- What are the key clinical points for Thyroid Uptake % (probe counts)?
- Site geometry/SOP.
- What are the limits and cautions when using Thyroid Uptake % (probe counts)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Thyroid Uptake % (probe counts) calculated in practice? Can you show a worked example?
- Inputs: Neck counts 50000, Thigh/background counts 2000, Standard/phantom counts 200000, Hours since administration 24 h, Nuclide I-123 → Result: % uptake 84.63 %（net: 48000, decay factor: 0.2836, T½: 13.2 h） Inputs: Neck counts 50000, Thigh/background counts 2000, Standard/phantom counts 200000, Hours since administration 24 h, Nuclide Tc-99m → Result: % uptake 382.23 %（net: 48000, decay factor: 0.0628, T½: 6.01 h）
💬 Peer discussion
Licensed clinicians only — about this Tool · Thyroid uptake
Do not share identifiable patient information (PHI). Discuss principles and workflow only — not a substitute for clinical judgement.
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