Biological sample collection card 

I. Characteristics

1. Easy to Collect
   • The biological sample collection card is simple to operate and does not require complex professional equipment. For example, when collecting a blood sample, only a lancet is needed to prick a finger, and the blood is dropped onto the filter paper of the collection card. This simple collection method enables non – professionals to collect samples after simple training, which is very suitable for large – scale sample collection work, such as population disease screening.
2. Good Sample Stability
   • The biological samples collected on the card can remain stable for a long time at room temperature. This means that the samples can be stored and transported without the need for special refrigeration equipment, greatly reducing the cost of sample storage and transportation. For example, some DNA samples can still be used for genetic testing and other analyses after being stored on the collection card for several years.
3. Convenient for Transportation and Storage
   • Due to the small size and light weight of the collection card and the fact that the sample is fixed on the filter paper without the risk of sample leakage, it is very convenient for transportation and storage. A large number of collection cards can be neatly stacked together, occupying little space, and are very convenient whether through mailing or internal transfer in the laboratory.

II.Application Scenarios

1. Medical Diagnosis
   • In the diagnosis of genetic diseases, biological sample collection cards are often used to collect samples such as heel – prick blood of newborns. Samples collected by collection cards can be used to detect whether newborns have genetic diseases, such as congenital hypothyroidism and phenylketonuria. In terms of infectious disease detection, blood, saliva and other samples of patients can also be collected by collection cards for virus infection detection, such as screening for AIDS, hepatitis B and other diseases.
2. Forensic Identification
   • In crime scene investigations, biological sample collection cards can be used to collect biological samples such as blood stains, saliva stains, and semen stains found at the scene. After these samples are collected and preserved by collection cards, they can be sent to forensic laboratories for DNA analysis, providing key evidence for case – solving.
3. Biomedical Research
   • In large – scale population studies, for example, in studying the genetic susceptibility of a certain disease, researchers can collect blood or saliva samples of a large number of volunteers through biological sample collection cards. These samples can be stored for a long time and used for subsequent gene analysis, protein analysis and other research, helping scientists better understand the pathogenesis of diseases and find new treatment methods.

V. Usage Methods

1. Pre – collection Preparation
   • Before collecting biological samples, it is necessary to ensure that the collection card is in a clean and dry state. At the same time, corresponding collection tools, such as lancets and sterile cotton swabs, should be prepared according to the sample type. If collecting a blood sample, the blood – collection site needs to be disinfected, usually by wiping the blood – collection site with an alcohol cotton ball.
2. Sample Collection
   • Conduct collection operations according to the sample type. Taking a blood sample as an example, after pricking a finger with a lancet, gently squeeze the blood – collection site and let the blood naturally drop onto the specified area of the filter paper of the collection card, avoiding blood spilling out of the filter paper range. Generally, a certain amount of blood, such as 3 – 5 drops, needs to be dropped at each sample point to ensure that there is enough sample volume for subsequent analysis.
3. Sample Drying
   • After collecting the sample, place the collection card flat in a clean, dry, and well – ventilated place and let the sample dry naturally. Avoid direct sunlight and high – temperature environments, as these factors may affect the stability of the sample. Generally, the sample can be completely dried within a few hours.
4. Sample Preservation and Transportation
   • The dried collection card can be placed in a special sample bag or envelope and stored at room temperature. If transportation is required, ensure that the collection card is well – packaged to avoid being squeezed or getting damp during transportation. During transportation, it is best to attach relevant information about sample collection, such as collection time, collector, and sample type, to facilitate subsequent analysis and processing.