Cleared Traditional

K780644 - RADIOASSAY FOR TOTAL SERUM THYROXINE (FDA 510(k) Clearance)

Class II Toxicology device cleared through predicate-based substantial equivalence - typically does not require clinical trials.

K780644 · Nuclear Diagnostics, Inc. · Toxicology device
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Apr 1978
Decision
11d
Days
Class 2
Risk

K780644 is an FDA 510(k) clearance for the RADIOASSAY FOR TOTAL SERUM THYROXINE. Classified as Radioimmunoassay, Total Thyroxine (product code CDX), Class II - Special Controls.

Submitted by Nuclear Diagnostics, Inc. (Mchenry, US). The FDA issued a Cleared decision on April 28, 1978 after a review of 11 days - a notably fast clearance cycle.

This device falls under the Toxicology FDA review panel, regulated under 21 CFR 862.1700 - the FDA toxicology device framework. The Traditional 510(k) pathway establishes clearance through substantial equivalence to a legally marketed predicate device, without requiring clinical trial data.

Device pattern: Fast-track predicate clearance. Standard predicate reliance. The short review cycle indicates strong predicate alignment - the FDA found sufficient equivalence without extended technical review.

View all Nuclear Diagnostics, Inc. devices

Submission Details

510(k) Number K780644 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received April 17, 1978
Decision Date April 28, 1978
Days to Decision 11 days
Submission Type Traditional
Review Panel Toxicology (TX)
Summary -
Third-party Review No - reviewed directly by FDA
Regulatory Context
Review time vs. panel average
76d faster than avg
Panel avg: 87d · This submission: 11d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

Device Classification

Product Code CDX Radioimmunoassay, Total Thyroxine
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 862.1700
What this classification means

Class II devices require demonstration of substantial equivalence to a legally marketed predicate device. This pathway does not require clinical trials - it relies on engineering equivalence and performance data. Most Toxicology devices follow this clearance model.