Room light or sunlight can metabolize the bilirubin in the specimen to a different compound. This will cause a falsely lower bilirubin level. A neonatal bilirubin specimen should be obtained in a dark-colored (amber) container.

Is bilirubin protected from light?

Conclusions: Bilirubin in plasma is stable in refrigerator or at room temperature without light exposure for at least 24 h. In normal laboratory environment, a delay of up to 8 h in the measurement of bilirubin left unprotected from light at room temperature does not significantly affect the results.

When collecting a specimen for bilirubin testing you must protect the specimen from?

Total bilirubin measures the entire concentration of bilirubin in the blood. collection. Centrifuge specimen, remove serum/plasma aliquot into plastic sample cup. Analyze within 2 hours, or protect from light by using foil or an amber tube.

What specimen should be protected from light?

Certain blood specimens are photosensitive and should be protected from light. Bilirubin, beta-carotene, and porphyrins among others are such blood constituents that break down in the presence of light.

How do you store a bilirubin sample?

For optimal stability, both darkness and low temperature are necessary. At room temperature, in total darkness, samples are stable for 2 days. Samples are stable for 4 to 7 days in the refrigerator and frozen samples are stable for 3 months if totally protected from light.

Bilirubin Metabolism

What happens when bilirubin is exposed to light?

Bilirubin is a substance absorbing light within the visible spectrum, and it is well recognized to undergo both isomerization and oxidation in serum exposed to visible light, resulting in decreased measured bilirubin values [10–14].

What special handling is needed for bilirubin specimens?

Which of the following special handling requirements is necessary for this specimen? Blood samples for bilirubin levels require protection from light, which the phlebotomist can achieve by wrapping the blood tube in foil.

What is the purpose of chilling a specimen?

What is the purpose of chilling a specimen? Chilling a specimen slows down metabolic processes and keeps analytes stable during transport and handling.

Why should you always shut a bili light off when collecting a bilirubin level?

Shut off phototherapy lamps when drawing blood samples for serum bilirubin. The light can degrade the bilirubin in the sample and cause inaccurate measurements.

Which drug must be wrapped to protect from light?

Diazepam Protect from light Nitroglycerin Protect from light Diazoxide Darkens on exposure to light and should be protected from light. Darkened solutions may be subpotent and should not be administered.

What blood tests need to be protected from light?

As such, laboratory practice mandates blood specimens for B12 and folate testing be protected from light after blood collection by wrapping the blood collection tube in aluminum foil or a commercially available light retardant wrap (eg, Coban, 3M, St. Paul, MN).

What is the importance of an accelerator in the test for bilirubin How does it function?

Because unconjugated bilirubin reacts slowly, accelerators such as methanol, ethanol, or caffeine, are used to release unconjugated bilirubin from the protein carrier albumin, the total bilirubin level is then measured. In the absence of these accelerators, the director bilirubin level can be measured by this method.

What happens after collecting bilirubin?

What Happens After a Bilirubin Test? The health professional will remove the elastic band and the needle and cover the area with cotton or a bandage to stop the bleeding. Afterward, there may be some mild bruising, which should go away in a few days.

What specimens should be chilled?

Certain analytes must be preserved prior to analysis by keeping the specimen chilled. To ensure accurate results of such specimens, transport them in ice slurry. i.e. ACTH, Acetone, Angiostensin Converting Enzyme (ACE), Blood Ammonia, Catecholamines, Free Fatty Acids, Lactic Acid, Pyruvate, Renin Activity.

What will be the effect of prolonged light exposure to urine bilirubin?

Urine bilirubin may be falsely decreased if the urine sample undergoes prolonged exposure to ultraviolet light or stands at room temperature exposed to air (bilirubin oxidizes into biliverdin, which is not detected).

What are the guidelines for specimen rejection?

• Unlabelled or mislabelled samples.
• Duplicate samples. Most duplicate samples received on the same day are unacceptable and should not be processed. ...
• Leaky containers. ...
• Contaminated samples. ...
• Inappropriate sample sources. ...
• Delayed transport time and sample processing.

How does light reduce bilirubin?

Phototherapy is treatment with a special type of light (not sunlight). It's sometimes used to treat newborn jaundice by lowering the bilirubin levels in your baby's blood through a process called photo-oxidation. Photo-oxidation adds oxygen to the bilirubin so it dissolves easily in water.

What effect does hemolysis of the specimen have on bilirubin tests?

What effect does hemolysis of the specimen have on bilirubin tests? It decreases the bilirubin level. U.S. law requires states to test for a minimum of two inherited conditions.

Do bilirubin levels decrease faster when more banks of lights are being used for treating infants with hyperbilirubinemia?

Intensive phototherapy requires a spectral irradiance of 30 W/cm2/nm, delivered over as much of the body surface as possible. The greater the body surface area exposed to light, the faster the decline in serum bilirubin.

Why do some blood specimens require cooling?

Some tests require that blood specimens be cooled in ice water, placed in warm water, or protected from light immediately following the venipuncture in order to prevent metabolic processes which may cause alteration of some test values.

Why must a specimen be wrapped separately?

Storage and shipping of dried blood spots

Each dried filter paper should be wrapped individually in paper, foil or plastic to prevent possible cross-contamination.

Why is it important that specimens delivered in the laboratory be properly collected and transported?

It is a foundational principle for any laboratory test procedure that the value of the test is compromised or even negated by using specimens that have not been properly collected, labelled, handled or stored prior to and during the testing process.

Why should urine specimens be protected from light?

Light Protection Verify that specimens submitted for testing of light-sensitive analytes are collected in containers that protect the specimen from light. This is a glimpse into the complexity of proper urine collection and handling.

How should samples and specimens be handled and collected?

1. Avoid patient identification errors. ...
2. Draw the tubes in the proper sequence. ...
3. Use proper containers for collection. ...
4. Mix all tubes ten times by gentle inversion immediately after collection.
5. Do not decant specimens from one type of container into another.

At which temperature should a Cryoglobulin specimen be transported to the lab?

Cryoglobulin is a common and simple clinical immunology laboratory test that requires the blood samples to be transported to the laboratory, without cooling, at 37°C (1, 5, 6).