← [Hematology](/submissions/HE) · Product Code HYO # HYO · Hematoxylin Weigert'S _Hematology · 21 CFR 864.1850 · Class 1_ **Canonical URL:** https://fda.innolitics.com/submissions/HE/subpart-b%E2%80%94biological-stains/HYO ## Overview - **Product Code:** HYO - **Device Name:** Hematoxylin Weigert'S - **Regulation:** 21 CFR 864.1850 - **Device Class:** 1 - **Review Panel:** [Hematology](/submissions/HE) - **GMP exempt:** yes ## Identification Dye and chemical solution stains for medical purposes are mixtures of synthetic or natural dyes or nondye chemicals in solutions used in staining cells and tissues for diagnostic histopathology, cytopathology, or hematology. ## Classification Rationale Class I (general controls). These devices are exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 864.9. These devices are also exempt from the current good manufacturing practice requirements of the quality management system regulation in part 820 of this chapter, except for requirements concerning records and complaint files under § 820.35 of this chapter. ## Cleared Devices (1) | Record | Device Name | Applicant | Decision Date | Decision | | --- | --- | --- | --- | --- | | [K833424](https://fda.innolitics.com/submissions/HE/subpart-b%E2%80%94biological-stains/HYO/K833424.md) | VEIGERT'S IRON HEMATOXYLIN STAIN-HT10-79 | Sigma Chemical Co. | Nov 3, 1983 | SESE | ## Top Applicants - Sigma Chemical Co. — 1 clearance --- **Source:** [https://fda.innolitics.com/submissions/HE/subpart-b%E2%80%94biological-stains/HYO](https://fda.innolitics.com/submissions/HE/subpart-b%E2%80%94biological-stains/HYO) **Published by [Innolitics](https://innolitics.com)** — a medical-device software consultancy. We help companies design, build, and clear FDA-regulated software and AI/ML devices. If you're preparing [a 510(k)](https://innolitics.com/services/510ks/), [a De Novo](https://innolitics.com/services/regulatory/), [a SaMD](https://innolitics.com/services/end-to-end-samd/), [an AI/ML medical device](https://innolitics.com/services/medical-imaging-ai-development/), or [an FDA regulatory strategy](https://innolitics.com/services/regulatory/), [get in touch](https://innolitics.com/contact). **Cite as:** FDA Device Explorer (Innolitics), https://fda.innolitics.com/submissions/HE/subpart-b%E2%80%94biological-stains/HYO