Table 1 Detection and characterization of interference using polyethylene glycol, heterophilic blocking tube, and streptavidin-coated magnetic particle SA-MP treatment
From: Falsely diagnosed thyrotoxicosis caused by anti-streptavidin antibodies and pre-wash procedures
| TSH, μIU/mL (RR: 0.50–5.00) | FT4, ng/dL (RR: 0.90–1.70) | FT3, pg/mL (RR: 2.3–4.0) | |
| Patient | |||
| Before PEG Tx | 4.67 | 2.66 | 5.88 |
| After PEG Tx (actual measured value) | 4.77 | 0.87 | 2.11 |
| After PEG Tx (calculated value) | 9.54 | – | – |
| TSH | FT4 | FT3 | |
| Recovery (%) | 204 (RR: 30–80) | 33 (RR: 60–90) | 36 (RR: 60–90) |
| TSH, μIU/mL (RR: 0.50–5.00) | FT4, ng/dL (RR: 0.90–1.70) | FT3, pg/mL (RR: 2.3–4.0) | |
| Patient | |||
| Before HBT Tx or SA-MP Tx | 4.36 | 2.15 | 4.27 |
| After HBT Tx | 6.49 | 1.68 | 3.86 |
| After SA-MP Tx | 9.81 | 1.04 | 2.7 |
| Control | |||
| Before HBT Tx and SA-MP Tx | 3.65 | 1.63 | 3.62 |
| After HBT Tx | 3.69 | 1.64 | 3.64 |
| After SA-MP Tx | 3.64 | 1.66 | 3.61 |