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If you are asked to return and parts of the foetus still cannot be seen, or it is necessary to check the position of the placenta more clearly, then a transvaginal ultrasound might need to be carried out (see Transvaginal Ultrasound ). In a transvaginal ultrasound, a small specially shaped transducer is used, which is slightly larger than a tampon and shaped to fit comfortably into the vagina. Because the transducer is closer to the foetus, it can provide clearer images. If a transvaginal ultrasound is needed, the procedure will be fully explained and your permission requested.
The procedure is usually performed under ultrasound control by a radiologist. The injection of blood contains small cells called platelets, which contain platelet derived growth factor. This substance is thought to promote tendon healing. A variation on the technique is Platelet Rich Plasma(PRP), which is where the whole blood removed from the patient is spun in a centrifuge, separating the cells of the blood. As such a higher concentration of platelets is delivered into the tissue for healing. As yet, there has been no study to demonstrate that a PRP injection is superior to ABI, with both techniques demonstrating improvement in 70-80% of patients.