From the Research
Contraindications for a bleed scan include pregnancy, breastfeeding, and known allergies to radiopharmaceuticals used in the procedure, as well as hemodynamic instability with active, massive bleeding, recent blood transfusions, and inability to remain still during the scan. The most recent and highest quality study on this topic is not directly provided in the given evidence, but based on the available information, it is clear that certain conditions pose risks or limitations for undergoing a bleeding scan.
- Pregnancy is a contraindication due to the potential risk of radiation exposure to the fetus, although the dose from commonly used radiopharmaceuticals like technetium-99m is generally considered low 1.
- Breastfeeding is also a consideration, as small amounts of radiopharmaceuticals can be excreted in breast milk, potentially exposing the infant to radiation.
- Known allergies to the radiopharmaceuticals used are a direct contraindication, as they could cause an adverse reaction in the patient.
- Hemodynamic instability with active, massive bleeding requires immediate intervention rather than diagnostic imaging, making the scan inappropriate in such emergency situations.
- Recent blood transfusions can affect the labeling process of red blood cells, leading to inaccurate results, and thus are relatively contraindicated within a certain timeframe (typically 24-48 hours) before the scan.
- The inability to remain still for the duration of the scan (usually 60-90 minutes) can make it difficult to obtain accurate images, unless sedation is possible. These considerations are crucial for determining the suitability of a patient for a bleeding scan, prioritizing their safety and the accuracy of the diagnostic procedure.