A method for improving the efficiency of DNA extraction from clotted blood samples

Maryam Mardan‐Nik, Sara Saffar Soflaei, Atefeh Biabangard‐Zak, Mahla Asghari, Sania Saljoughian, Amir Tajbakhsh, Zahra Meshkat, Gordon A. Ferns, Alireza Pasdar* (Corresponding Author), Majid Ghayour‐Mobarhan* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)
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Background The efficient and rapid extraction of high‐quality genomic DNA from clotted blood samples, which normally have a low yield and poor quality, is an important factor in genomic research. The objective of this study was to develop a simple and safe technique for dispersing the blood clots by the ball bearing metal shots. Normally, such clot samples may not have an acceptable yield by conventional DNA extraction methods. Also, in the present study, we have further investigated to improve salting‐out DNA extraction methods. Methods Initially, 500 µL phosphate‐buffered saline (PBS) (1×) and two ball bearing metal shots were added to each tube of the clotted blood sample and then were gently rotated in an electric laboratory rotator for 1 hour at room temperature (18‐25°C). Genomic DNA was then extracted from samples using a modified salting‐out method and a modified QIAamp® DNA Blood Midi Kit and was compared with QIAamp® DNA Blood Midi Kit as a control. An assessment of the concentration and quality of the extracted DNA was performed using the UV‐visible spectrophotometer. The isolated DNA proved amenable to PCR amplification and gel electrophoresis. Results The yield and purity of DNA obtained by these three methods were significantly different (P < 0.001), with a higher yield in the modified salting‐out method. Conclusions Our proposed modified salting‐out method is simple and efficient for the isolation of DNA from old blood clot samples. It is both easy to use and is of low cost in routine laboratory tasks.
Original languageEnglish
Article numbere22892
Number of pages7
JournalJournal of Clinical Laboratory Analysis
Issue number6
Early online date10 May 2019
Publication statusPublished - Jul 2019

Bibliographical note

Funding information:
This study was supported by a grant from the Research Council of the Mashhad University of Medical Sciences (Grant No: 931680).

The authors would like to thank Dr. Hossein Eshghi at Department of Chemistry, Faculty of Science, the Ferdowsi University of Mashhad for his assistance in the experiment and Mohammad Sadegh Khorami who contributed to this study. We are also particularly grateful to the Research Council of the Mashhad University of Medical Sciences (MUMS) for the financial support of this study


  • clotted blood
  • DNA extraction
  • frozen
  • salting out


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