Gestation Calculator

This calculator has been designed to give you an idea of the treatment options available to you*. If you decide to have an abortion with Marie Stopes UK, one of our nurses will give a more approximate gestation date during your appointment by way of a scan.
*Please note that this online calculator will only give you an estimated gestation based on the details you have provided.

Please select the first day of your last menstrual period.



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How do I use my vasectomy testing kit?

On the day of your vasectomy, you will be given two sample kits as well as exact dates to take and send in the samples.

Postal semen testing: your sample packs

Your sample packs will include:

  • 2 condoms
  • 2 semen collecting kits, each containing a small sample pot, a transport container and a plastic envelope
  • 2 prepaid envelopes
  • 2 laboratory slips
  • 2 dressings to replace the one the doctor will have placed on your wound

When to do the test after the vasectomy

At least 16 weeks after your vasectomy procedure, you should send in a sample of semen through the post using your sample pack. All post is free and the envelope are discreet.

It is advised that in between your treatment, and sending off your first sample, you have at least 25 ejaculations, between 2-3 a week to clear the remaining sperm in your system. 

At least 14 days after taking your first sample, you will need to take a second sample and post it as above. 5 days later you'll receive your results. 

Male client talking to nurse at Marie Stopes

The sample process

  • Ejaculate into the special condom provided and empty all of your semen into the sample pot. Throw the condom away – do not include it in the sample pot or post.
  • When all the semen is in the sample pot, screw the lid on tightly and write your full details and date on the pot. You must do this for the laboratory to be able to use your sample.
  • Put the sample pot into the larger transport container to protect it in the post.
  • Fill out your details on the laboratory slip and ensure that it says your name, date of birth, centre, client number and date of ejaculation. If any details are missing the sample cannot be tested.
  • Put the laboratory slip and the transport container into the plastic envelope and seal it. Put the pack into the pre-paid padded envelope making sure it is well-sealed before posting.

Receiving your test results

Currently, there are two ways to receive your test results from Marie Stopes UK.

  • Call 0345 120 3641 for your test results ( or if you are calling from overseas, call us on 0044 1454 457542).^

  • We will also write to you with your results – please wait for the letter to confirm that your vasectomy has been successful.

You may be required to produce further samples – if this happens Marie Stopes UK will provide you with further kits and contact you when all samples have been received and analysed.

Need to talk about your options with Marie Stopes UK?

Our specialist staff are on hand 24/7 to offer expert advice and support – from your initial consultation to treatment aftercare. Call us now on 0345 300 0212 or email services@mariestopes.org.uk 

^ Our vasectomy test result team is available from 08:00 to 16:00 - Monday to Friday. Outside of these hours, you can call us on the 24hr vasectomy line 0345 300 02 12 and we will arrange a time for the team to call you back).