GA/T 148-2019 in English

VALID

Forensic medicine—Specifications for specimen collection,fixation,sampling and preservation

Issued on:2019-10-14
Implemented on:2019-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
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Standard No:	GA/T 148-2019
Document status:	VALID
Title in English:	Forensic medicine—Specifications for specimen collection,fixation,sampling and preservation
Title in Chinese:	法医学　病理检材的提取、固定、取材及保存规范
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-10-14
Implemented on:	2019-12-01
ICS Classification:	13.310-Protection against crime
Chinese Classification:	A92-Crime judging technology
Professional Classification:	GA-Security
Related Keywords:	specimen preservation specimen preservation period specimen collection preservation introduction core changes forensic medicine specifications
Related Topics:	Forensic extract forensic science pathology Inspection material Extractor principle Extraction, fixation, packaging and inspection methods of forensic pathological materials material extractant take materials medical disease Extractor Extractor extract... Internal extractor principle Extractor usage How long is it stored after stream fixation Forensic material Forensic material gross specimen extract Forensic material solid phase extraction Principle of extraction Extraction, preservation and submission of forensic biological materials for examination Extraction, fixation, collection and preservation of forensic pathological examination materials Tissue extraction and fixation methods ga/t1012-2019 Pathological wax block preservation ga/t148-2019 Enzyme liquid extraction and determination methods Enzyme extraction principle and identification method ga/t49-2019 ga/t 148-2019

本标准规定了法医学中病理检材的提取、固定、包装、送检、取材及保存的原则、内容和方法。
本标准适用于各级公安、检察机关、医学院校及面向社会服务的鉴定机构所进行的法医病理学检验。

Introduction

Core changes in the standard revision

Technical elements	1996 edition	XXXX edition	Main points of change
Standard structure	Chapter 7	Chapter 9	New chapter on specimen preservation (Chapter 9)
Fixative solution specifications	Only formalin is specified	Neutral formalin configuration is added	pH value control requirements (7.0-7.4)
Specimen preservation period	Undefined	12-month benchmark	Strengthening legal risk prevention and control

Analysis of key technical points

1. Three-dimensional specification for specimen extraction

Chapter 4 of the standard clearly requires: Injury specimens must carry adjacent normal tissues, including:

Current spot: When the diameter is greater than 4cm, strips of tissue must be taken across the maximum diameter
Neck cord groove: Longitudinal incision perpendicular to the cord groove
Bone marrow extraction: For hematopoietic system diseases, more than 3 sites must be extracted (ilium/sternum/femur)

2. Scientific ratio of fixative

Chapter 5 of the standard specifies two core fixatives:

Conventional 10% formalin: formaldehyde: water = 1:9 (prepared and used immediately)
Neutral buffered formalin: add phosphate buffer (pH7.0-7.4)

Typical case: Acidic formalin fixation of bleeding foci is prone to produce brown-black precipitates, and the neutral formula can effectively avoid this phenomenon.

Special requirements for organ processing

Cardiac conduction system sampling

Standard 8.1.3 stipulates:

Sinoatrial node: 3-4cm tissue longitudinally cut at the junction of the superior vena cava and right atrium
Atrioventricular bundle: The vertical section on the left side of the coronary sinus includes the atrial septum and ventricular septum

Standardized brain cutting method

The 12-cut 13-piece coronal cutting method is adopted:

4th cut: sampling from the middle frontal gyrus/cingulate gyrus
7th cut: sampling from the mammillary body
8th cut: double sampling of the hippocampus/thalamus

Implementation suggestions

Sample container management: Special containers with a diameter of ≥30cm and a height of ≥32cm. Mixing of samples from multiple cases is prohibited
Infectious disease prevention and control: HIV and other positive samples must be marked with a red label and stored separately
Sample packaging: Long-distance transportation requires 3-4 layers of formalin gauze + sealed plastic bag + hard outer box

More samples: JGJ 94-2008 JC/T 2453-2018 GB 50021-2001(2009)

Sample only — not a preview of GA/T 148-2019

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